Managing HP Serviceguard A.11.20.20 for Linux, May 2013

Figure 8 Quorum Server Operation
A quorum server can provide quorum services for multiple clusters. Figure 9 illustrates quorum
server use across four clusters.
Figure 9 Quorum Server to Cluster Distribution
IMPORTANT: For more information about the quorum server, see the latest version of the HP
Serviceguard Quorum Server release notes at http://www.hp.com/go/hpux-serviceguard-docs
(Select HP Serviceguard Quorum Server Software).
3.2.10 No Cluster Lock
Normally, you should not configure a cluster of three or fewer nodes without a cluster lock. In
two-node clusters, a cluster lock is required. You may consider using no cluster lock with
configurations of three or more nodes, although the decision should be affected by the fact that
any cluster may require tie-breaking. For example, if one node in a three-node cluster is removed
for maintenance, the cluster re-forms as a two-node cluster. If a tie-breaking scenario later occurs
due to a node or communication failure, the entire cluster will become unavailable.
42 Understanding Serviceguard Software Components